How does furosemide treat high blood pressure?

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Furosemide (Lasix), a strong diuretic, may be prescribed to treat high blood pressure (hypertension) if your current medications aren't working well. Furosemide stimulates your body to produce more urine so that it can be excreted. Less fluid in the body means less blood volume for your body to push through your cardiovascular system, which brings about a drop in blood pressure.

This drop may be rapid, though. Be careful not to stand up too quickly if you're taking furosemide, which also can cause your blood pressure to drop. If you're taking other medications for high blood pressure, your doctor will likely reduce your dosage of these drugs before giving you furosemide.